ci: Attempt different coverage configuration

.github/workflows/ci.yml

@@ -31,5 +31,5 @@ jobs:
           Join-Path (Resolve-Path ~).Path "scoop\shims" >> $Env:GITHUB_PATH
           scoop install gettext
       - run: pip install tox
-      - run: tox
+      - run: tox -- coverage run --source=ocdsextensionregistry --append -m pytest
       - uses: coverallsapp/github-action@v2

setup.cfg

@@ -40,6 +40,7 @@ console_scripts =
 
 [options.extras_require]
 test =
+    coverage
     pytest
 cli =
     Babel

tox.ini

@@ -1,25 +1,15 @@
 [tox]
-envlist = clean,py-sphinx{5,6,7}
+envlist = py-sphinx{5,6,7}
 
 [testenv]
 constrain_package_deps = true
 extras =
     cli
     test
-commands =
-    # -W error is not set, as older Sphinx versions can have deprecation warnings from dependencies.
-    coverage run --source=ocdsextensionregistry --append -m pytest
+# -W error is not set, as older Sphinx versions can have deprecation warnings from dependencies.
+commands = {posargs:pytest}
 deps =
-    coverage
     sphinx5: Sphinx>=5,<6
     sphinx6: Sphinx>=6,<7
     sphinx7: Sphinx>=7,<8
     sphinx{5,6}: docutils<0.19
-depends =
-    py-sphinx{4,5,6}: clean
-    report: py-sphinx{4,5,6}
-
-[testenv:clean]
-deps = coverage
-skip_install = true
-commands = coverage erase